Generation of Long-Lived Charge Separated State in Photoinduced Electron Transfer of Twisted m- and p-Di(phenylethynyl)benzene-Linked Triphenylamine-Naphthaldiimide Dyads

Abstract

Recently, photo-induced charge separation of various donor-acceptor dyads has been actively investigated. The construction of artificial systems that enable the efficient formation of long-lived charge separated (CS) states with large chemical potentials is an important goal in these studies. We report that simple triphenylamine-naphthaldimide dyads using highly twisted m- and p-di(phenylethynyl)benzene spacers cleanly generate long-lived CS states over a microsecond lifetime with high efficiencies. The CS states were shown to be derived via intersystem crossing within singlet CS states.